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[NTOS:MM] MmCanFileBeTruncated: Check whether second (optional) parameter was passed (#5248)

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Second parameter is optional, so mark it as such and check whether it was passed. Fixes a sporadic 0x24 bugcheck caused by access violation when running ReactOS on NTFS volume with WinXP ntfs.sys.
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Adam Słaboń 2023-04-19 23:12:11 +02:00 committed by GitHub
parent 058726a2c1
commit 6eb8fe4f82
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1 changed files with 12 additions and 4 deletions
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16
ntoskrnl/mm/section.c
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@ -4209,9 +4209,11 @@ MmMapViewOfSection(IN PVOID SectionObject,
/*
* @unimplemented
*/
BOOLEAN NTAPI
MmCanFileBeTruncated (IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
IN PLARGE_INTEGER NewFileSize)
BOOLEAN
NTAPI
MmCanFileBeTruncated(
_In_ PSECTION_OBJECT_POINTERS SectionObjectPointer,
_In_opt_ PLARGE_INTEGER NewFileSize)
{
BOOLEAN Ret;
PMM_SECTION_SEGMENT Segment;
@ -4237,7 +4239,7 @@ MmCanFileBeTruncated (IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
/* If the cache is the only one holding a reference to the segment, then it's fine to resize */
Ret = TRUE;
}
else
else if (NewFileSize != NULL)
{
/* We can't shrink, but we can extend */
Ret = NewFileSize->QuadPart >= Segment->RawLength.QuadPart;
@ -4248,6 +4250,12 @@ MmCanFileBeTruncated (IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
}
#endif
}
else
{
DPRINT1("ERROR: File can't be truncated because it has references held to its data section\n");
Ret = FALSE;
}
MmUnlockSectionSegment(Segment);
MmDereferenceSegment(Segment);